Driver behaving weirdly?

I live in a flat block and I occasionally have an issue with drivers being unable to figure out how to enter the building and others who demand I come downstairs to meet them where they parked. There are several small stairwells where you can enter with the classic buzzer door where you ring the flat number and they let you in. Ours doesn't work for whatever reason so the doors to the stairwell are permanently unlocked.

From time to time it takes the driver a moment to push the unlocked door but last night's order was truly bizarre.

The guy buzzed the door multiple times, I picked up the phone to stop the ringing each time. He then called me on my mobile three times and hung up as soon as I answered.

I heard nothing for a few minutes assuming he'd figured it out, checked the app and found that he had gone halfway down the road. So I messaged him the instructions on the app that he had to just push the door and got no answer. I then called him multiple times and he'd do the same thing and hang up.

Not sure what changed but at some point he phoned me back and told me to come downstairs because he can't get in. I explained to him several times on the phone that the stairwell door is open and he just has to push it. He told me "ok I'm coming to you".

He walked to my GPS location two floors below me, I was on the balcony and he started shouting he has no way to get to me "up there". He was about to knock on the downstairs neighbours door before I stopped him. I pointed him towards the stairwell a few feet away from him and he just kept repeating the question. I got a bit sick of it so went inside and miraculously he made it upstairs, still complaining.

Was he trying to make it look like I didn't answer? I can't explain the weird phonecalls and hangups and then driving off otherwise. Is he just dumb?